I?ve had my DeWalt set since the late 1990?s. Yes, the 18V NiCad XRP multi-tool set with the huge blow molded plastic case.
Hard construction use on the hammer/drill. and saws all, occasional use on the circular saw. I have been through 3 sets of batteries, and have recently gotten a set of third party Li-Ion batteries (2) to fit the old style tools and an adaptor (DeWalt) to use the modern DeWalt factory Li-Ion batteries and 2 - 4 amp batteries.
So, I now have 4 batteries and will using this DeWalt set well into the 2020?s and maybe beyond.
So far I have noticed that both sets of batteries do not suffer from self discharging when setting unused for a few weeks, since I am not in the heavy construction aspect of my industry anymore.Yet, the in use life of the Li-Ion batteries is well beyond what the NiCads would do.